Invalidation of taxa within the silvery wooly monkey (, Atelidae, Primates).

The systematics of the Humboldt's wooly monkeys (; Atelidae) is essential to preserve this Neotropical primate species. Traditionally, four morphological subspecies have been described, which recently have been molecularly confirmed. However, no population genetics studies have been carried out throughout the geographical distribution of one of these subspecies, .

First Molecular Phylogenetic Analysis of the Lagothrix Taxon Living in Southern Peru and Northern Bolivia: Lagothrix lagothricha tschudii (Atelidae, Primates), a New Subspecies.

We sequenced mitochondrial COI and COII genes (1,377 base pairs) of 166 woolly monkeys (Lagothrix) to determine the phylogenetic relationships of tschudii in reference to the other taxa within the genus Lagothrix, to provide the first genetic diversity level estimates for tschudii, and to reconstruct the historical demographic evolution of this taxon. The sample set included, for the first time, 10 individuals of the elusive tschudii taxon sensu Groves from southern Peru and northern Bolivia. Our phylogenetic analyses showed that these 10 exemplars formed a statistically significant and differentiated (molecularly and morphologically) monophyletic clade relative to other traditional subspecies of Lagothrix lagothricha.